37 lines
1.3 KiB
Rust
37 lines
1.3 KiB
Rust
use crate::definitions::{DefKey, DefPathData, DisambiguatedDefPathData};
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use rustc_span::def_id::{DefPathHash, StableCrateId};
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#[test]
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fn def_path_hash_depends_on_crate_id() {
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// This test makes sure that *both* halves of a DefPathHash depend on
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// the crate-id of the defining crate. This is a desirable property
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// because the crate-id can be more easily changed than the DefPath
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// of an item, so, in the case of a crate-local DefPathHash collision,
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// the user can simply "role the dice again" for all DefPathHashes in
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// the crate by changing the crate disambiguator (e.g. via bumping the
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// crate's version number).
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let id0 = StableCrateId::new("foo", false, vec!["1".to_string()]);
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let id1 = StableCrateId::new("foo", false, vec!["2".to_string()]);
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let h0 = mk_test_hash(id0);
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let h1 = mk_test_hash(id1);
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assert_ne!(h0.stable_crate_id(), h1.stable_crate_id());
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assert_ne!(h0.local_hash(), h1.local_hash());
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fn mk_test_hash(stable_crate_id: StableCrateId) -> DefPathHash {
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let parent_hash = DefPathHash::new(stable_crate_id, 0);
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let key = DefKey {
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parent: None,
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disambiguated_data: DisambiguatedDefPathData {
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data: DefPathData::CrateRoot,
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disambiguator: 0,
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},
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};
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key.compute_stable_hash(parent_hash)
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}
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}
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